Coloring Damage

At the beginning of June I dyed my hair for the first time. At the end of August I decided to dye it again because the roots had grown out quite a bit. I got a different color than I got the first time because I wanted it a little more brown(it ended up having reddish tints when I dyed it the first time). Well it turned out a VERY dark brown, almost black, with reddish tints to it. I HATED the color so I decided to redye it. My mom told me I should wait at least 2 wks so I didn't overprocess my hair. I waited 1 week and didnt want to wait any longer cuz I really didn't like the color. I dyed it and now the color looks great but my hair feels real dry and brittle. I usually blow my wavy/curly hair straight but I didn't want it to all break off so I've been letting it air-dry and wearing it curly for the past week(it was Monday when I redyed it). I've also used a leave in deep conditioner a few times this week(I'd wash it at night, apply the leave in conditioner, wrap a towel around and let it soak in while I slept). I've used a hot oil treatment too. My hair is still pretty dry though and I was wondering if anyone here has any suggestions on how I can repair the damage and make my hair soft once again? Also do you know how long it will take? Thanks in advance for any adivce.